Marking pen



FIG. 1 is a perspective view of the top, front and left side of a marking pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side elevational view thereof with a cap removed;

FIG. 8 is a left side elevational view thereof with the cap removed;

FIG. 9 is a front elevational view thereof with the cap removed;

FIG. 10 is a top plan view thereof with the cap removed; and,

FIG. 11 is bottom plan view thereof with the cap removed. 

The ornamental design for a marking pen, as shown and described. 